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Hydrogel gratings with patterned analyte responsive dyes for spectroscopic sensing.

Ruchi Gupta1, Sameh El Sayed1, Nicholas J Goddard2

  • 1School of Chemistry, University of Birmingham Birmingham B15 2TT UK s.elsayed@bham.ac.uk r.gupta.3@bham.ac.uk.

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Summary

This study introduces novel hydrogel gratings with integrated dyes for spectroscopy. These gratings enable sensitive analyte detection and quantification by measuring changes in diffracted light intensity.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Analytical Chemistry

Background:

  • Hydrogel gratings offer potential for integrated sensing applications.
  • Developing novel spectroscopic methods for analyte detection is crucial.

Purpose of the Study:

  • To report unprecedented hydrogel gratings with analyte-responsive dyes for spectroscopy.
  • To demonstrate sensing and quantification of analytes using these gratings.

Main Methods:

  • Fabrication of hydrogel gratings using laser interferometric lithography.
  • Immobilization of pH-sensitive fluorescein isothiocyanate dye.
  • Measurement of diffracted light intensity and ratios for analyte quantification.

Main Results:

  • Hydrogel gratings showed analyte concentration-dependent changes in diffraction efficiency.
  • Ratio of diffracted intensities at two wavelengths provided accurate analyte quantification, reducing errors.
  • pH sensing demonstrated a linear response over 4 pH units, exceeding conventional methods.

Conclusions:

  • The developed hydrogel gratings serve as effective dispersive elements for spectroscopy.
  • This approach offers enhanced dynamic range and accuracy for analyte sensing.
  • The method holds promise for advanced chemical sensing applications.